"The short answer is fear. Just purely fear," says Person when Asylum asked him why he spends his weekends designing bulletproof doors. Person had recently achieved the adult trifecta of wife-baby-house and found his protective instincts kicking into high gear -- so he decided to replace the pool with something a bit more useful.

"After a little while of careful thought, it really made logical sense to turn it into a bunker where I could store water and resources and food and weapons," says Person.

Keep reading to get an underground tour and learn how to make your own robot shotgun sentry.

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